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Subject[PATCHv2 10/11] clocksource/drivers/rockchip_timer: implement reading 64bit value from timer
Date
Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
---
drivers/clocksource/rockchip_timer.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

diff --git a/drivers/clocksource/rockchip_timer.c b/drivers/clocksource/rockchip_timer.c
index c2b0454..6224aa9 100644
--- a/drivers/clocksource/rockchip_timer.c
+++ b/drivers/clocksource/rockchip_timer.c
@@ -19,6 +19,8 @@

#define TIMER_LOAD_COUNT0 0x00
#define TIMER_LOAD_COUNT1 0x04
+#define TIMER_CURRENT_VALUE0 0x08
+#define TIMER_CURRENT_VALUE1 0x0C
#define TIMER_CONTROL_REG3288 0x10
#define TIMER_CONTROL_REG3399 0x1c
#define TIMER_INT_STATUS 0x18
@@ -72,6 +74,25 @@ static void rk_timer_update_counter(u64 cycles, struct rk_timer *timer)
writel_relaxed(upper, timer->base + TIMER_LOAD_COUNT1);
}

+static u64 rk_timer_counter_read(struct rk_timer *timer)
+{
+ u64 counter;
+ u32 lower;
+ u32 upper, old_upper;
+
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ do {
+ old_upper = upper;
+ lower = readl_relaxed(timer->base + TIMER_CURRENT_VALUE0);
+ upper = readl_relaxed(timer->base + TIMER_CURRENT_VALUE1);
+ } while (upper != old_upper);
+
+ counter = upper;
+ counter <<= 32;
+ counter |= lower;
+ return counter;
+}
+
static void rk_timer_interrupt_clear(struct rk_timer *timer)
{
writel_relaxed(1, timer->base + TIMER_INT_STATUS);
--
1.7.9.5
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